<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
	</head>
	<body>
		<div></div>
		<div></div>
		<form>
			<input type="checkbox" id="a" />
			<label for="a">兴趣部落一</label>

			<input type="checkbox" id="b" />
			<label for="b">兴趣部落二</label>

			<input type="checkbox" id="c" />
			<label for="c">兴趣部落三</label>
		</form>
	</body>
	<style>
		body {
			margin: 0;
			padding: 0;
		}
		div:nth-child(1) {
			width: 0;
			height: 0;
			border: 100px solid red;
			border-color: transparent transparent #0099cc transparent;
			/* transform: rotate(90deg); */
		}
		div:nth-child(2) {
			width: 0;
			height: 0;
			border-color: red transparent;
			border-style: solid;
			border-width: 0 0 100px 50px;
			/* transform: rotate(90deg); */
		}
	</style>
</html>
